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重点词组:tell a story sing a song 如何询问和回答“你正在做什么”?---What are you doing? ---I'm v-ing. 如何询问和回答“他/她正在做什么”?---What is he/she doing? ---He's/She's v-ing.
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重点词组:tell a story sing a song 如何询问和回答“你正在做什么”?---What are you doing? ---I'm v-ing. 如何询问和回答“他/她正在做什么”?---What is he/she doing? ---He's/She's v-ing.
